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Black Hat USA has released a schedule update announcing the cancellation of the highly-anticipated talk regarding TOR—the popular online privacy tool—at this year’s upcoming conference in Las Vegas.

The talk, titled “You Don’t Have to be the NSA to Break TOR: De-Anonymizing Users on a Budget,” was to be presented by CERT/Carnegie Mellon University researcher Alexander Volynkin. However, Black Hat received a notification late last week from the Software Engineering Institute (SEI) and the university’s legal counsel that Volynkin would no longer be presenting.

“Mr. Volynkin will not be able to speak at the conference since the materials that he would be speaking about have not yet approved by CMU/SEI for publish release,” read the notice.

“Disclosing vulnerability information to the public is a tricky end-over that must be handled with care,” said security researcher Lamar Bailey. “Some researchers want to tell the world about their findings, but if they have not gone through a responsible disclosure process, the talk can do more harm than good by exposing all the users.”

TOR (The Onion Router) is an open network that provides increased privacy, and anonymity, by encrypting a user’s browsing traffic and re-routing it through various other arbitrary proxy servers.

The project was originally developed by the U.S. Naval Research Laboratory, primarily for protecting government communication. Now, TOR’s website claims it is used “for a wide variety of purposed by normal people, the military, journalists, law enforcement officers, activists, and many others.”

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